I don't understand this. They were INSIDE, right? So not negatively impacting on anyone's street, as given as a reason by the police?
Unless there are hugely mitigating circumstances (and even then, jeez) that haven't come out, such as they were holding an 18,000 decibel rave for two days, or they were chucking bottles out of the door at people, or... or... or... you get the gist. EVEN IF the police think they were provoked, where the fucking hell in any procedure does it say 'so just take their stuff'. Food? Since when has food been a 'temporary structure'?